Shameless plug, I'm a member of FenixEdu, a open source academic and learning management system. I think that people might find it interesting.
FenixEdu was designed for a single school for the past 10 years and now we are trying to refactor it to be installed anywhere. We want to create that can tackle the needs for the next decade of teaching. If people are interested in this kind of thing please talk with us, we are most welcome to receive any kind of suggestion or feedback.